Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT): The limitations are the same for TSS and pH as specified in Sec. 415.172. Subpart R--Sodium Metal Production Subcategory [Reserved] Subpart S--Sodium Silicate Production Subcategory [Reserved]